Crank mechanism.



Patented Sept. I7, |,90|.

C. G. HOLMBERG.

CRANK MECHANISM.

(Application filed Feb. 1, 1901.) (No Model.) 2 Sheets-Sheet l.

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Nu. 682,935. Patented Sept. I7, 190|. C. G. HULMBERG.

CRANK MECHANISM.

(Application mea Feb. 1. 1901.1 (No Model.)

2 Shasta-Sheet 2.

. W/ TNE SSE S Q BY g' A 7TOHNEYS UNTTED STATES PATENT OFFICE.

CHARLES GUSTAVE HOLMBERG, OF WOONSOCKET, SOUTH DAKOTA, ASSIGNOR TO ANNA I-IOLMBERG, JOHN M. WHEELER, AND LOREN H. PIER, OF SAME PLACE.

vCRANK MECHANISIVI.

SPECIFICATION forming part of Letters Patent No. 682,935, dated September 17, 1901 Original application led October 4, 1900, Serial No. 31,975` Divided and this application filed February 1, 1901. Serial T0 all whom it may concern:

Be it known that I, CHARLES GUsTAvE l-IOLMBERG, a citizen of the United States, and a resident of Woonsocket, in the county of Sanborn and State of South Dakota, have invented a new and Improved Crank Mechanism, of which the following is a full, clear, and exact description, this being a division of the application for Letters Patent of the United States for an engine, Serial No. 31,975, filed by me on October 4, 1900.

The object of the invention is to provide a new and improved crank mechanism for the transmission of power, and more especially for use on oscillating engines and other machines, and arranged to avoid dead-center positions.

The invention consists of novel features and parts and combinations of the same, as will be fully described hereinafter and then pointed out in the claims.

A practical embodiment of the invention is represented in the accompanying drawings, forming a part of this specification, in which similar characters of reference indicate corresponding parts in all the views.

Figure l is a side elevation of the improvement as applied to an oscillating engine o'f p The engine on which the improvement is` shown applied in the drawings consists of a cylinder' A, in which oscillates a piston (not shown) secured on a transversely-extending i shaft C, mounted to turn in suitable bearings e in the heads of the cylinder and connected at one outerend by a-double crank D with pitmen E E', connected with the crank-arms F F2 of the main driving-shaft F, sov that when an` oscillating motion is given to the piston in` the cylinder A and to the shaft C then the crank D., pitmen E E', and crank-arms F F2` (No model.)

impart a continuous rotary motion to the main shaft F. The crank is made in sections D D2, pivotallyconnected with each other at adjacent ends by links D3, extending diametrically relatively to the piston-shaft C, and said sections are pivoted on opposite sides of the links D3 on the fork-arms C C2, carried by the main shaft C, as is plainly indicated in Figs. 2, 3, 4, and 5. The pitmen E E have their wrist-pins E2 E3 adjustably secured in alined slots D4 D5 in the outer portions of the crank-sections D' D2, respectively. By this arrangement the pitmen E E can be properly adjusted relatively to the sections D' D2 and crank-arms F F2. The fork-arms C C2 on the oscillation of the piston B and the shaft C carry the crank-sections D D2 of the crank along, so that the pitmen E E and crank-arms F' F2 impart a rotary motion to the main shaft F. Itis understood that the action of the fork-arms C C2 on the crank-sections is such as to impart simultaneous motion to the crank-sections, but in opposite directions, and as the crank-sections are connected with each other by the link D2 the sections act on their pitmen to push the one and pull the other, so that the shaft receives at all times power from two points. As the shaft C, with its fork-arms C C2, oscillates and the main shaft F, with its crank-arms F F2, rotates it is evident that the crank-sections D' D2 on each full oscillation of the shaft C and the corresponding full revolution of the shaft F assume different positions relatively to each other and to the crank-arms. The crank-sections D D2 stand 1 in alinement with each other, as shown in Fig. 4, during part of the revolution given to the shaft F; but when the pitmen cross each other, as shown in Fig. 5, the sections D' D2 move into angular positions to avoid deadcenter positions and at the same time compensate for the dierent position of the pitmen during a revolution of the shaft F.

Having thus fully described my invention, I claim as new and desire -to secure by Letters Patentl. Acrank mechanism havingacrank made in sections, and links forconnecting the inner ends of the sections With each other, as set forth.

2. A crank mechanism comprising an oseillatng shaft having fork-arms, a crank made in sections held on said fork-arms, links connecting the inner ends of the sections with each other, and pitmen connected with the outer ends of the said sections, as set forth.

3. A crank mechanism, comprising an oscillating shaft having fork-arms, a crank made in sections held on said fork-arms, links conmeeting the inner ends of the sections with each other, pitmen connected with the outer ends of said sections', and a main or driven shaft having diametrically-arranged crankarms connected withsad pitmen, as set forth.

4. Acrankmechanisln forconneetingan oscillating shaft with a rotary shaft, comprising a crank made in sections standing across the oscillating shaft and pivoted on fork-arms of the said oscillating shaft, a link for connecting the inner ends of the crank-sections with each other, the link standing,r approximately at a right ang-le to the sections and diametrically across the oscillating shaft, and connections between the outer ends of the cranksections and the crank-arms on the rotaryT shaft, substantially as shown and described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

CHARLES GUSTAVE H0 LMBERG.

Witnesses:

L. H. PIER, S. J. MITCHELL. 

